stacklok / toolhive / 19338819441

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Add MCP elicitation support for vMCP composite workflows (#2562)

* Add MCP elicitation support for vMCP composite workflows

Implement user interaction in vMCP workflows using the MCP elicitation
protocol. Workflows can now request user input during execution via
elicitation steps with accept/decline/cancel responses.

Key changes:
- Add ElicitationProtocolHandler as thin wrapper around MCP SDK
- Implement elicitation step execution in workflow engine
- Add workflow state store for future persistence
- Include security limits: 1hr timeout, 100KB schema, 1MB content
- Add comprehensive tests (30 test cases, race detector clean)

The implementation uses a thin SDK-agnostic abstraction to enable future
migration from mark3labs SDK to the official MCP SDK without changing
workflow code.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Fix timeout comment (10 minutes, not 1 hour)

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Co-authored-by: Claude <noreply@anthropic.com>

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